CN103032347B - There is the centrifugal compressor of isolation structure - Google Patents
There is the centrifugal compressor of isolation structure Download PDFInfo
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- CN103032347B CN103032347B CN201210058802.9A CN201210058802A CN103032347B CN 103032347 B CN103032347 B CN 103032347B CN 201210058802 A CN201210058802 A CN 201210058802A CN 103032347 B CN103032347 B CN 103032347B
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Abstract
The invention provides a kind of centrifugal compressor with isolation structure, comprising: rotor body (11), be positioned at motor cavity (A); Rotor shaft (13), extend in motor tail end oil back chamber (B) along the axial of rotor body (11) from motor cavity (A), (13) are formed with compound seal section to rotor shaft, comprise multiple seal isolation structure in compound seal section; There is the isolating seal collar (20) of through hole, be set in the periphery of compound seal section, and jointly motor cavity (A) and motor tail end oil back chamber (B) are isolated with compound seal section.The centrifugal compressor with isolation structure provided by the invention, utilize the compound seal section comprising multiple seal isolation structure be arranged on rotor shaft, and be positioned at the isolating seal collar of periphery of compound seal section, utilize the seal isolation characteristic that different sealing isolation structure is different separately, improve the seal isolation performance between the motor cavity of compressor and motor tail end oil back chamber.
Description
Technical field
The present invention relates to air-conditioning technical field, especially, relate to a kind of centrifugal compressor with isolation structure.
Background technique
In direct connection frequency conversion centrifugal compressor, because rotor is in the state of High Rotation Speed always, if seal improper, be easy to cause a large amount of lubricant oil to leak into motor cavity from oil circuit side, finally enter vaporizer with motor cooling circuit.Because the lubricant oil in vaporizer can not evaporate, finally more poly-more, float on vaporizer refrigerant liquid level, have a strong impact on evaporator heat exchange, cause unit efficiency to decline.
The sealing means being usually used in centrifugal compressor oil circuit side and medium side is labyrinth seal or the screw seal of single formula.Because the form structure by axle affects, labyrinth seal is smooth type sealing mostly, sealability is very large to effect length by seal shaft, structure limits by length, the sealing effect that often can not get, therefore conventional centrifuge often draws road pressurized gas from spiral case and enters between labyrinth seal and seal, like this, the high pressure refrigerant gas of quite a few enters in vaporizer through motor, causes the waste of cold in the middle of invisible.Spiral seal affects by rotor speed, sealability increases with the increase of rotating speed, but power consumption also increases thereupon, because centrifuge fuel feeding pressure reduction is substantially constant, if when running at the low rotational speed, spiral seal does not probably reach seal request and causes oil leakage to enter in motor cavity.Therefore, be necessary to find a kind of structure that can obtain better sealing effect between high and low rotating speed, to improve the sealability between the motor cavity of centrifugal compressor and motor tail end oil back chamber.
Summary of the invention
The object of the invention is to provide a kind of centrifugal compressor with isolation structure, to solve the technical problem of the sealing effect difference between the motor cavity of existing centrifugal compressor and motor tail end oil back chamber.
For achieving the above object, according to an aspect of the present invention, provide a kind of centrifugal compressor with isolation structure, comprising: rotor body, is positioned at motor cavity; Rotor shaft, axially extending in motor tail end oil back chamber from motor cavity along rotor body, rotor shaft is formed with compound seal section, comprises multiple seal isolation structure in compound seal section; There is the isolating seal collar of through hole, be set in the periphery of compound seal section, motor cavity and motor tail end oil back chamber are isolated.
Further, multiple seal isolation structure comprises the trapping screw thread of close rotor body one end and the oil removal screw thread away from rotor body one end that are positioned at compound seal section, and trapping screw thread is contrary with the Hand of spiral of oil removal screw thread.
Further, thread interruption district is provided with between trapping screw thread and oil removal screw thread.
Further, thread interruption district is provided with radial land, the outer wall of land and the inner side ring wall Spielpassung of the isolating seal collar protruded.
Further, the axial length of the overlay area of trapping screw thread is less than the axial length of the overlay area of oil removal screw thread.
Further, multiple seal isolation structure comprises labyrinth seal structure and spiral seal structure.
Further, multiple seal isolation structure also comprise between labyrinth seal structure and spiral seal structure area of space in inflatable structure.
Further, the isolating seal collar is formed with the water conservancy diversion annular groove of axis centered by the through-bore axis of the isolating seal collar on the first end face of motor tail end oil back chamber.
Further, water conservancy diversion annular groove takes the shape of the letter U cross section, comprises interior side ring surface and the outside anchor ring positioned opposite with interior side ring surface, the interior side ring surface of water conservancy diversion annular groove is provided with the annular water conservancy diversion flange radially stretched out.
Further, the second side that water conservancy diversion flange has first side parallel with the first end face of the isolating seal collar, is inclined to set with the first side, and be connected to the end face between the first side and the second side, the parallel to an axis of end face and rotor shaft.
Further, labyrinth seal structure is positioned at one end of the close rotor body of compound seal section, and spiral seal structure is positioned at one end away from rotor body of compound seal section.
Further, labyrinth seal structure comprises the comb of multiple tip towards motor tail end oil back chamber.
Further, the quantity of comb is seven to ten five.
Further, spiral seal structure comprises the thread section that is opened in compound seal section and is positioned at smooth section relative with thread section on the inner peripheral surface of the isolating seal collar.
Further, spiral seal structure is 0.4 to 1 times of the external diameter of rotor shaft along the axially extended length of rotor shaft.
Further, spiral seal structure comprises the smooth end that is opened in compound seal section and is positioned at thread section relative with smooth section on the inner peripheral surface of the isolating seal collar.
Further, in the area of space between labyrinth seal structure and spiral seal structure, be formed with the tool withdrawal groove be opened in compound seal section, in tool withdrawal groove, be provided with the inflatable boss that the radially outward along rotor shaft stretches out.
Further, the centrifugal compressor with isolation structure provided by the invention, comprise electric machine casing and be positioned at the back end cover for motor of one end of electric machine casing, motor rear end covers the passage being formed with and being communicated between motor cavity and motor tail end oil back chamber, bearing mounting base plate is provided with in passage, bearing mounting base plate is provided with bearing mounting hole, is provided with the bearing coordinated with rotor shaft in bearing mounting hole, rotor shaft extend in motor tail end oil back chamber through bearing.
Further, the isolating seal collar is connected with bearing mounting base plate, and and is formed with oil back chamber between bearing mounting base plate.
Further, part rotor shaft being positioned at oil back chamber is provided with one or morely gets rid of oil groove.
Further, the quantity of getting rid of oil groove is three, and three are got rid of oil groove and conjointly be arranged in parallel in turn.
According to another aspect of the present invention, additionally provide a kind of centrifugal compressor with isolation structure, comprise: motor cavity, motor tail end oil back chamber, be positioned at the rotor body of motor cavity and extend into the rotor shaft of motor tail end oil back chamber along the axis of rotor body, rotor shaft offers isolation screw thread and with isolation screw thread be connected get rid of oil groove, the periphery of isolation screw thread is arranged with the isolating seal collar, motor cavity and motor tail end oil back chamber separate by the isolating seal collar, get rid of oil groove and are positioned at motor tail end oil back chamber.
Further, isolation screw thread comprises the trapping screw thread near motor cavity one end and the oil removal screw thread near motor tail end oil back chamber one end, and trapping screw thread is contrary with the Hand of spiral of oil removal screw thread, is provided with thread interruption district between trapping screw thread and oil removal screw thread.
Further, thread interruption district is provided with radial land, the outer wall of land and the through-hole wall Spielpassung of the isolating seal collar protruded.
Further, the quantity of getting rid of oil groove is one or more.
Further, the quantity of getting rid of oil groove is three, and three are got rid of oil groove and conjointly be arranged in parallel in turn.
The present invention has following beneficial effect:
The centrifugal compressor with isolation structure provided by the invention, utilize the compound seal section comprising multiple seal isolation structure be arranged on rotor shaft, and be positioned at the isolating seal collar of periphery of compound seal section, utilize the seal isolation characteristic that different sealing isolation structure is different separately, improve the seal isolation performance between the motor cavity of compressor and motor tail end oil back chamber.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation between the motor cavity of the first mode of execution of the first centrifugal compressor of the present invention and motor tail end oil back chamber;
Fig. 2 is the partial enlargement structural representation in the I portion in Fig. 1;
Fig. 3 is the structural representation between the motor cavity of the second mode of execution of the first centrifugal compressor of the present invention and motor tail end oil back chamber;
The schematic diagram of the labyrinth seal structure of the second mode of execution of Fig. 4 the first centrifugal compressor of the present invention;
Fig. 5 is the close-up schematic view of the spiral seal structure of the second mode of execution of the first centrifugal compressor of the present invention;
Fig. 6 is the close-up schematic view of the inflatable structure of the second mode of execution of the first centrifugal compressor of the present invention;
Fig. 7 is the structural representation getting rid of oil groove and oil back chamber of the second mode of execution of the first centrifugal compressor of the present invention;
Fig. 8 is the partial enlargement structural representation getting rid of oil groove of the second mode of execution of the first centrifugal compressor of the present invention; And
Fig. 9 is the partial enlargement structural representation getting rid of oil groove of the second centrifugal compressor of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As shown in Figure 1, the invention provides a kind of centrifugal compressor with isolation structure, comprising: rotor body 11, be positioned at motor cavity A; Rotor shaft 13, axially extending in motor tail end oil back chamber B from motor cavity A along rotor body 11, the part that rotor shaft 13 is positioned at motor cavity A is formed with compound seal section, comprises multiple seal isolation structure in compound seal section; There is the isolating seal collar 20 of through hole, be set in the periphery of compound seal section, and jointly motor cavity A and motor tail end oil back chamber B is isolated with compound seal section.
As shown in Figure 2, as a kind of mode of execution, multiple seal isolation structure can comprise the trapping screw thread 31 of close rotor body 11 one end and the oil removal screw thread 32 away from rotor body 11 one end that are positioned at compound seal section, and trapping screw thread 31 is contrary with the Hand of spiral of oil removal screw thread 32.
In order to make the better effects if of trapping and oil removal, between trapping screw thread 31 and oil removal screw thread 32, be provided with thread interruption district.
Thread interruption district is provided with radial land 15, the outer wall of land 15 and the inner side ring wall Spielpassung of the isolating seal collar 20 protruded.Matching gap between the outer wall of land 15 and the inner side ring wall of the isolating seal collar 20 is 0.12 to 0.15mm.
The axial length of the overlay area of trapping screw thread 31 is less than the axial length of the overlay area of oil removal screw thread 32.And the matching gap between the inner side ring wall of the external diameter of trapping screw thread 31 and oil removal screw thread 32 and the isolating seal collar 20 is 0.12 to 0.15mm.
As shown in Figure 3, as another kind of mode of execution, multiple seal isolation structure can comprise labyrinth seal structure 33 and spiral seal structure 35.Labyrinth seal structure 33 is positioned at one end of the close rotor body 11 of compound seal section, and spiral seal structure 35 is positioned at one end away from rotor body 11 of compound seal section.
As shown in Figure 4, labyrinth seal structure 33 can be smooth type labyrinth seal structure, and this labyrinth seal structure 33 can comprise the comb 33a of multiple tip towards motor tail end oil back chamber B.Each comb apex angle α is 15 ° to 25 °; The end face width L1 of each comb 33a is 0.2mm to 1mm; End face width and the interdental space sum L2 of each comb 33a are 2mm to 3.5mm; The height h1 of each comb is 1.5mm to 3.5mm; The ratio of the interdental space (L2-L1) between the height h1 of each comb 33a and adjacent comb 33a is 0.6 to 2.
The quantity of comb 33a can be 7 to 15, and concrete quantity can be determined by the pressure reduction at labyrinth seal structure 33 two ends, is 0.15mm to 0.4mm with the matching gap (diameter) of rotor element.
As shown in Figure 5, spiral seal structure 35 comprises the thread section that is opened in compound seal section and is positioned at smooth section relative with thread section on the inner peripheral surface of the isolating seal collar 20.Now, the outer diameter D of thread section is 0.8 to 1 times of the external diameter of rotor shaft 13.
Spiral seal structure 35 is 0.4 to 1 times of the external diameter of rotor shaft 13 along the axially extended length L4 of rotor shaft 13.The matching gap of the inner peripheral surface of thread section and the isolating seal collar 20 is 0.15mm to 0.4mm.In fact, the smooth end of spiral seal structure 35 also can be arranged in compound seal section, and thread section can be opened on the inner peripheral surface of the isolating seal collar 20.
If Fig. 6 is simultaneously shown in composition graphs 3, the area of space between labyrinth seal structure 33 and spiral seal structure 35 can be formed with inflatable structure 34 in conjunction with the tool withdrawal groove 36 of the machining screw of rotor shaft 13.Inflatable structure 34 is formed by the inflatable boss 34a being positioned at tool withdrawal groove 36, and inflatable boss 34a is 1 to 3 along the ratio of the interdental space (L2-L1) of the width L3 of the axis of rotor shaft 13 and each comb 33a; Inflatable boss 34a is 1.5 to 4 along the area A 2 in the cross section of the axis of rotor shaft 13 with the ratio of the area A 1 in the cross section of the axis along rotor shaft 13 of comb.
As shown in Figure 7, the isolating seal collar 20 is formed with water conservancy diversion annular groove 21 on first end face of motor tail end oil back chamber B.Water conservancy diversion annular groove 21 takes the shape of the letter U cross section, comprises interior side ring surface 21a and the outside anchor ring 21b positioned opposite with interior side ring surface 21a, wherein, interior side ring surface 21a is provided with the water conservancy diversion flange 23 that the radially outward along rotor shaft 13 stretches out.The second side that water conservancy diversion flange 23 has first side parallel with the first end face 20a of the isolating seal collar 20, is inclined to set with the first side, and be connected to the end face between the first side and the second side, the parallel to an axis of end face and rotor shaft 13.The height h2 of water conservancy diversion flange 23 is 1.5mm to 4mm; Angle β between first side of water conservancy diversion flange 23 and the first side is 15 ° to 45 °; The end face width L5 of water conservancy diversion flange 23 is 0.2mm to 2mm.
In fact, see Fig. 1 and Fig. 3 again, centrifugal compressor provided by the invention also comprises electric machine casing 60 and is positioned at the back end cover for motor 70 of one end of electric machine casing 60, back end cover for motor 70 is formed with the passage be communicated between motor cavity A and motor tail end oil back chamber B, bearing mounting base plate 71 is provided with in passage, bearing mounting base plate 71 is provided with bearing mounting hole, be provided with the bearing 73 coordinated with rotor shaft 13 in bearing mounting hole, rotor shaft 13 extend in motor tail end oil back chamber B through bearing 73.
The isolating seal collar 20 is connected with bearing mounting base plate 71, and and is formed with oil back chamber C between bearing mounting base plate 71.
As shown in Figure 8 and Figure 9, part rotor shaft 13 being positioned at oil back chamber C is provided with one or morely gets rid of oil groove 50.As the optional mode of one, the quantity of getting rid of oil groove 50 can be three, and three are got rid of oil groove 50 and conjointly be arranged in parallel in turn.
Each oil groove 50 that gets rid of includes groove part 51 and flange portion 53, the width L7 of groove part 51 is 4.5mm to 5.5mm, groove part 51 is formed with the plane of inclination towards motor tail end oil back chamber B lopsidedness that tilt angle gamma is 20 ° to 45 °, the height h3 of flange portion 53 is 1.5mm to 4mm, and the end face width L6 of flange portion 53 is 0.2mm to 1.5mm.
In this kind of mode of execution (see Fig. 3), by labyrinth seal structure 33, inflatable structure 34, spiral seal structure 35, get rid of oil groove 50, the acting in conjunction of water conservancy diversion annular groove 21, when have lubricated the oil after bearing 73 and flowing toward motor tail end oil back chamber B, first oil groove 50 is got rid of through epitrochanterian, because rotor high-speed rotates, under centrifuge effect, the oil being attached to groove part 51 surface of getting rid of oil groove 50 can throw away along the tangent direction of plane of inclination, therefore most oil is got rid of and flowed back to fuel tank to oil back chamber, those are by the oil got rid of to compound seal section, under the effect of water conservancy diversion flange 23, water conservancy diversion annular groove 21 is entered along guide ring inclined-plane, through the guide functions of water conservancy diversion annular groove 21, successfully flow to bottom, finally flow back to fuel tank from drainback passage G.When the oil on axle does not throw away completely, under back oil cavity pressure effect, when continuing to flow toward motor cavity A, spiral seal section will be entered, because thread rotary orientation is identical with rotor sense of rotation, when the rotor rotates, spiral seal structure will produce an active force toward pusher, be called that pump efficiency is answered, like this, oil will be pushed back and gets rid of oil groove side and can not flow toward motor cavity A direction, when compressor is in running, the gas of certain pressure will be assembled at inflatable structure place, on the one hand when spiral seal structure can not seal oil completely, again an inhibition be produced to oil herein, play certain sealability, on the other hand, when after compressor shutdown, because rotor speed slowly lowers, now oil pump does not also stop, namely the possibility that oil flows toward motor cavity A is still had, now because air cavity structure place prestores the cold media air of certain pressure, in compressor shutdown process, pressure can not decline immediately, but slowly change, therefore in stopping process, oil is leaked and plays the effect that is hindered flowing, in running, the cold media air of motor cavity A also can flow toward motor tail end oil back chamber B, now by after the step-down gradually of labyrinth seal structure, basic and after spiral seal structure the pressure of pressure arriving inflatable structure place balances each other, therefore, under above each sealing configuration effect, the sealability of motor tail end oil back chamber B and motor cavity A improves greatly, through experimental verification, after oil in fuel tank ran continuously at several days, oil level does not have downward trend.The centrifugal compressor with isolation structure provided by the invention can improve sealability, reduces leakage rate, thus contributes to the efficiency improving Compressor Group; And in the present invention, integrated type processing and assembling are carried out for composite seal structure, thus contribute to improving work efficiency and assembly precision.
Again as depicted in figs. 1 and 2, according to another aspect of the present invention, additionally provide a kind of centrifugal compressor with isolation structure, comprise: the rotor body 11 being positioned at motor cavity A and the rotor shaft 13 of motor tail end oil back chamber B extend into along the axis of rotor body 11, rotor shaft 13 offers isolation screw thread and with isolation screw thread be connected get rid of oil groove 50, wherein, the periphery of isolation screw thread is arranged with the isolating seal collar 20, motor cavity A and motor tail end oil back chamber B separates by this isolating seal collar 20, gets rid of oil groove 50 and is positioned at motor tail end oil back chamber B.Utilize isolation screw thread, get rid of the isolation that the combining form of oil groove and the isolating seal collar 20 realizes cooled gas and lubricant oil simultaneously, isolation effect is good, structure is simple, only need on rotor shaft, offer screw thread simultaneously and get rid of oil groove, processing cost is lower, and due to isolation effect good, improve the life-span of compressor.In fact, motor cavity A is formed by electric machine casing 60 and back end cover for motor 70, and motor tail end oil back chamber B inside electric machine casing 60, stretches out by back end cover for motor 70 formed space and the isolating seal collar 20 is formed.
Isolation screw thread comprises the trapping screw thread 31 near motor cavity A one end and the oil removal screw thread 32 near motor tail end oil back chamber B one end, and trapping screw thread 31 is contrary with the Hand of spiral of oil removal screw thread 32, isolation screw thread be adopted as bidirectional screw sealing, can make lubricant oil and refrigerant completely isolated.Such as, from the tail end of rotor shaft 13, trapping screw thread 31 adopts the worm structure counterclockwise rotated, in motor operation course, trapping screw thread 31 can stop the cooled gas of cooling motor to be entered in motor tail end oil back chamber B by the gap between the isolating seal collar 20 and rotor shaft 13, and then is dissolved in lubricant oil.Oil removal screw thread 32 adopts dextrorotation, and lubricant oil can be stoped in motor operation course to be entered inside motor cavity A by the gap between the isolating seal collar 20 and rotor shaft 13.Because trapping screw thread 31 is near motor cavity A one end, be used to choke, therefore need not increase and get rid of oil groove.The structure that such Hand of spiral is contrary, some are blocked because of the acting in opposition of oil removal screw thread 32 by the gas of trapping screw thread 31, in like manner, some are blocked because of the acting in opposition of trapping screw thread 31 by the oil of oil removal screw thread 32, thus play better sealing effect.
Thread interruption district is provided with between trapping screw thread 31 and oil removal screw thread 32.Can not be communicated with between the spiral seal of two ends; otherwise when emergency shutdown; once the differing pressure of motor cavity A and motor tail end oil back chamber B is comparatively large, be then easy to make the gas in trapping screw thread 31 enter motor tail end oil back chamber B or make the oil in oil removal screw thread 32 enter motor cavity A.
During in order to there is larger pressure reduction between motor cavity A and motor tail end oil back chamber B, reduce the mutual infiltration of air-channel system and oil-way system as much as possible, thread interruption district is provided with the radial land 15 protruded, and the gap between the outer wall of land 15 and the through-hole wall of the described isolating seal collar 20 is 0.12 to 0.15mm.
Because the trapping screw thread 31 near motor cavity A is for choke, the oil removal screw thread 32 of the bearing lubrication device near motor bearings place is for oil resistance, in actual motion, because oil ratio gas more easily permeates, therefore can by slightly shorter for the axial length of the overlay area of the trapping screw thread 31 of choke, the overlay area of the oil removal screw thread 32 of oil resistance slightly longer along the axial length, can realize better sealing effect like this on the axle of equal length.
Because the monolateral gap of rotor shaft 13 and bearing 40 is at about 0.7 ~ 0.10mm, therefore isolation screw thread and the isolating seal collar 20 between gap monolateral should at about 0.12 ~ 0.15mm, otherwise excesssive gap then amount of leakage is comparatively large, and gap is too small, can interfere with rotor shaft 13.
The quantity of getting rid of oil groove 50 can be one, also can be multiple.As the optional mode of execution of one, the quantity of getting rid of oil groove 50 is three, and three are got rid of oil groove 50 and conjointly be arranged in parallel in turn.The outlet port of the oil removal spiral 32 of motor tail end oil back chamber B one end is provided with three sections and gets rid of oil groove 50, two kinds of oil resistance modes coordinate the oil that the gap by the isolating seal collar 20 and trapping screw thread 31 and thread interruption district can be infiltrated to get rid of away, simultaneously, two sections of close bearing 40 one end are got rid of oil groove and can be got rid of away by the oil on rotor shaft 13 in advance, alleviate the oil mass entered between oil removal screw thread 32 and the isolating seal collar 20, play the effect of isolation lubricating oil further.
Again as shown in Figure 9, as the optional mode of execution of one, each oil groove 50 that gets rid of includes groove part 51 and flange portion 53, the width L7 of groove part 51 is 4.5mm to 5.5mm, groove part 51 is formed with the plane of inclination towards motor tail end oil back chamber B lopsidedness that tilt angle gamma is 20 ° to 45 °, utilizes this plane of inclination effectively to be thrown away by oil.The height h3 of flange portion 53 is 1.5mm to 4mm, and the end face width L6 of flange portion 53 is 0.2mm to 1.5mm.
Rotor shaft 13 is positioned at one end of motor tail end oil back chamber, once rotor shaft 13 glued on top has oil, is thrown away by oil by oil removal screw thread 32, enters and get rid of oil groove 50, in operation process, by centrifugal force, oil is thrown away along the 45 ° of inclined-planes got rid of in oil groove 50.
In rotor operation process, the cooled gas in motor cavity A when wanting to be entered in motor tail end oil back chamber B with isolation screw thread by the isolating seal collar 20, hinder by trapping screw thread 31, rotating speed is higher, and choke effect is better; In like manner, rotating speed is higher, and the oil resistance effect of oil removal screw thread is better.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (30)
1. there is a centrifugal compressor for isolation structure, it is characterized in that, comprising:
Rotor body (11), is positioned at motor cavity (A);
Rotor shaft (13), extend in motor tail end oil back chamber (B) along the axial of described rotor body (11) from described motor cavity (A), (13) are formed with compound seal section to described rotor shaft, comprise multiple seal isolation structure in described compound seal section;
There is the isolating seal collar (20) of through hole, be set in the periphery of described compound seal section, described motor cavity (A) and described motor tail end oil back chamber (B) are isolated,
Wherein, the described isolating seal collar (20) is formed with the water conservancy diversion annular groove (21) of axis centered by the through-bore axis of the described isolating seal collar (20) on the first end face of described motor tail end oil back chamber (B).
2. the centrifugal compressor with isolation structure according to claim 1, it is characterized in that, described multiple seal isolation structure comprises the trapping screw thread (31) of close described rotor body (11) one end being positioned at described compound seal section and the oil removal screw thread (32) away from described rotor body (11) one end, and described trapping screw thread (31) is contrary with the Hand of spiral of described oil removal screw thread (32), the Hand of spiral of described oil removal screw thread (32) is identical with described rotor body (11) sense of rotation.
3. the centrifugal compressor with isolation structure according to claim 2, is characterized in that, is provided with thread interruption district between described trapping screw thread (31) and described oil removal screw thread (32).
4. the centrifugal compressor with isolation structure according to claim 3, it is characterized in that, described thread interruption district is provided with radial land (15), the outer wall of described land (15) and the inner side ring wall Spielpassung of the described isolating seal collar (20) protruded.
5. the centrifugal compressor with isolation structure according to claim 2, is characterized in that, the axial length of the overlay area of described trapping screw thread (31) is less than the axial length of the overlay area of described oil removal screw thread (32).
6. the centrifugal compressor with isolation structure according to claim 1, is characterized in that, described multiple seal isolation structure comprises labyrinth seal structure (33) and spiral seal structure (35).
7. the centrifugal compressor with isolation structure according to claim 6, it is characterized in that, described multiple seal isolation structure also comprises the inflatable structure (34) of the area of space be positioned between described labyrinth seal structure (33) and described spiral seal structure (35).
8. the centrifugal compressor with isolation structure according to claim 1, it is characterized in that, described water conservancy diversion annular groove (21) takes the shape of the letter U cross section, comprise interior side ring surface (21a) and the outside anchor ring (21b) positioned opposite with described interior side ring surface (21a), the interior side ring surface (21a) of described water conservancy diversion annular groove (21) is provided with the annular water conservancy diversion flange (23) of radially stretching out.
9. the centrifugal compressor with isolation structure according to claim 8, it is characterized in that, the second side that described water conservancy diversion flange (23) has first side parallel with first end face (20a) of the described isolating seal collar (20), is inclined to set with described first side, and the end face be connected between described first side and described second side, the parallel to an axis of described end face and described rotor shaft (13).
10. the centrifugal compressor with isolation structure according to claim 9, is characterized in that, the angle between described first side and described second side is β, wherein, and 15 ° of < β <45 °.
11. centrifugal compressors with isolation structure according to claim 9, it is characterized in that, described multiple seal isolation structure comprises labyrinth seal structure (33) and spiral seal structure (35), described labyrinth seal structure (33) is positioned at one end of the close described rotor body (11) of described compound seal section, and described spiral seal structure (35) is positioned at one end away from described rotor body (11) of described compound seal section.
12. centrifugal compressors with isolation structure according to claim 11, is characterized in that, described labyrinth seal structure (33) comprises the comb (33a) of multiple tip towards described motor tail end oil back chamber (B).
13. centrifugal compressors with isolation structure according to claim 12, is characterized in that, the drift angle of described comb (33a) is α, wherein, and 15 ° of < α <25 °.
14. centrifugal compressors with isolation structure according to claim 12, is characterized in that, the quantity of described comb (33a) is seven to ten five.
15. centrifugal compressors with isolation structure according to claim 14, it is characterized in that, described spiral seal structure (35) comprises the thread section that is opened in described compound seal section and is positioned at smooth section relative with described thread section on the inner peripheral surface of the described isolating seal collar (20).
16. centrifugal compressors with isolation structure according to claim 15, is characterized in that, the external diameter of described thread section is 0.8 to 1 times of the external diameter of rotor shaft (13).
17. centrifugal compressors with isolation structure according to claim 15, it is characterized in that, described spiral seal structure (35) is 0.4 to 1 times of the external diameter of described rotor shaft (13) along the axially extended length of described rotor shaft (13).
18. centrifugal compressors with isolation structure according to claim 15, it is characterized in that, described spiral seal structure (35) comprises the smooth end that is opened in described compound seal section and is positioned at thread section relative with described smooth section on the inner peripheral surface of the described isolating seal collar (20).
19. centrifugal compressors with isolation structure according to claim 13, it is characterized in that, be formed with the tool withdrawal groove (36) be opened in described compound seal section in area of space between described labyrinth seal structure (33) and described spiral seal structure (35), in described tool withdrawal groove (36), be provided with the inflatable boss (34a) that the radially outward along described rotor shaft (13) stretches out.
20. centrifugal compressors with isolation structure according to claim 19, it is characterized in that, described inflatable boss (34a) is 1 to 3 along the ratio of distances constant between the width and adjacent two described comb (33a) of the axis of described rotor shaft (13).
21. centrifugal compressors with isolation structure according to any one of claim 1 to 20, it is characterized in that, comprise electric machine casing (60) and be positioned at the back end cover for motor (70) of one end of described electric machine casing (60), described back end cover for motor (70) is formed with the passage be communicated between described motor cavity (A) and described motor tail end oil back chamber (B), bearing mounting base plate (71) is provided with in described passage, described bearing mounting base plate (71) is provided with bearing mounting hole, the bearing (73) coordinated with described rotor shaft (13) is installed in described bearing mounting hole, described rotor shaft (13) extend in described motor tail end oil back chamber (B) through described bearing (73).
22. centrifugal compressors with isolation structure according to claim 21, it is characterized in that, the described isolating seal collar (20) is connected with described bearing mounting base plate (71), and and is formed with oil back chamber (C) between described bearing mounting base plate (71).
23. centrifugal compressors with isolation structure according to claim 22, is characterized in that, the part described rotor shaft (13) being positioned at described oil back chamber (C) is provided with one or morely gets rid of oil groove (50).
24. centrifugal compressors with isolation structure according to claim 23, it is characterized in that, get rid of oil groove (50) described in each and include groove part (51) and flange portion (53), described groove part (51) is formed with the plane of inclination towards motor tail end oil back chamber (B) lopsidedness that tilt angle gamma is 20 ° to 45 °.
25. centrifugal compressors with isolation structure according to claim 23, is characterized in that, described in get rid of oil groove (50) quantity be three, and get rid of oil groove (50) described in three and conjointly be arranged in parallel in turn.
26. 1 kinds of centrifugal compressors with isolation structure, it is characterized in that, comprise: motor cavity (A), motor tail end oil back chamber (B), be positioned at the rotor body (11) of described motor cavity (A) and extend into the rotor shaft (13) of motor tail end oil back chamber (B) along the axis of described rotor body (11), described rotor shaft (13) offers isolation screw thread and be connected with described isolation screw thread get rid of oil groove (50), the periphery of described isolation screw thread is arranged with the isolating seal collar (20), described motor cavity (A) and described motor tail end oil back chamber (B) separate by the described isolating seal collar (20), the described oil groove (50) that gets rid of is positioned at described motor tail end oil back chamber (B), the described isolating seal collar (20) is formed with the water conservancy diversion annular groove (21) of axis centered by the through-bore axis of the described isolating seal collar (20) on the first end face of described motor tail end oil back chamber (B).
27. centrifugal compressors with isolation structure according to claim 26, it is characterized in that, described isolation screw thread comprises the trapping screw thread (31) near described motor cavity (A) one end and the oil removal screw thread (32) near described motor tail end oil back chamber (B) one end, and described trapping screw thread (31) is contrary with the Hand of spiral of described oil removal screw thread (32), the Hand of spiral of described oil removal screw thread (32) is identical with described rotor body (11) sense of rotation, thread interruption district is provided with between described trapping screw thread (31) and described oil removal screw thread (32).
28. centrifugal compressors with isolation structure according to claim 27, it is characterized in that, described thread interruption district is provided with radial land (15), the outer wall of described land (15) and the through-hole wall Spielpassung of the described isolating seal collar (20) protruded.
29. centrifugal compressors with isolation structure according to any one of claim 26 to 28, is characterized in that, described in get rid of oil groove (50) quantity be one or more.
30. centrifugal compressors with isolation structure according to claim 29, is characterized in that, described in get rid of oil groove (50) quantity be three, and get rid of oil groove (50) described in three and conjointly be arranged in parallel in turn.
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| CN201210058802.9A CN103032347B (en) | 2011-09-28 | 2012-03-07 | There is the centrifugal compressor of isolation structure |
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| CN103032347B true CN103032347B (en) | 2015-08-19 |
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| CN105156033B (en) * | 2015-09-24 | 2017-07-21 | 西南石油大学 | A kind of high speed rock bit bearing spiral and reverse acting spiral combined sealing structure |
| CN107091244B (en) * | 2017-05-19 | 2024-02-27 | 珠海格力电器股份有限公司 | Lubricating oil flow guiding assembly, motor, compressor and air conditioner |
| CN108915787A (en) * | 2018-08-09 | 2018-11-30 | 中国船舶重工集团公司第七0三研究所 | A kind of steam turbine helixseal structure |
| CN110329476B (en) * | 2019-05-31 | 2020-12-25 | 武汉船用机械有限责任公司 | Oil distributor |
| CN110332118A (en) * | 2019-08-01 | 2019-10-15 | 珠海格力电器股份有限公司 | Compressor and air-conditioner set with water conservancy diversion annular groove |
| CN113137370A (en) * | 2021-04-27 | 2021-07-20 | 浙江真空设备集团有限公司 | Sealing structure of vacuum pump |
| CN115539433B (en) * | 2022-09-30 | 2023-06-06 | 浙江镕达永能压缩机有限公司 | Sealing system and method for self-regenerative nitrogen isolated high-pressure steam centrifugal compressor |
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